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The Mars ultraviolet dayglow variability: SPICAM observations and model comparison
Gérard, Jean-Claude; Cox, Cédric; Bougher, Stephen W. et al.
2009European Planetary Science Congress 2009
 

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Keywords :
Mars; dayglow; nitric oxide
Abstract :
[en] Limb profiles of the CO Cameron and CO2+ doublet airglow have been observed over different conditions (latitude, season, SZA, F10.7). They have been individually modelled using currently accepted cross sections, and outputs from the MTGCM. They have been shown to co-vary, with a ICO/ICO2+ ratio of about 4.7, less than the modelled ratio.The peak brightness varies linearly with the F10.7 solar flux proxy, in a way compatible with the Mariner 6 and 7 observations. The intensity of both emissions is overestimated by the model (but large uncertainties exist in excitation cross sections). An increase of the altitude of both emissions has been observed during the 2005 summer season. It is a consequence of the dust load, followed by an increased thermospheric CO2 density observed with SPICAV during the same period. This density enhancement is partly predicted by GCM models.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Cox, Cédric ;  Université de Liège - ULiège > SEGI : Etudes et intégr. de systèmes : Antenne administr.
Bougher, Stephen W.
Bertaux, J.-L.
Language :
English
Title :
The Mars ultraviolet dayglow variability: SPICAM observations and model comparison
Publication date :
16 September 2009
Event name :
European Planetary Science Congress 2009
Event organizer :
EPSC
Event place :
Potsdam, Germany
Audience :
International
Available on ORBi :
since 02 November 2011

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